The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2008
Filed:
Mar. 30, 2001
Teruhiko Kori, Kanagawa, JP;
Asako Fujii, New York, NY (US);
Teruhiko Kori, Kanagawa, JP;
Asako Fujii, New York, NY (US);
Sony Corporation, Tokyo, JP;
Abstract
To enable usage of content at a receiver which does not have a copying function even if copyright protection is provided. Model names of receivers not having a copying funtion are held in an authentication processing circuit of a transmitter. When a model name obtained from a connected receiver is held, regardless of whether the content is copyright protected, a signal selection circuit selects a terminal a side, a switch is turned on, and an unencrypted signal is transmitted. When a change of the receiver is detected by a hot plug detection or plug and play function at a processing circuit during the signal transfer of copyright protected content without providing copyright protection, the selection circuit selects a terminal b side or the switch is turned off to suspend the transfer of the non-copyright protected signal. The information indicating the receiver is held in a tamper-proof updateable manner.